Investigators looking for clues to what set off Las Vegas gunman

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Flowers, candles and toys are left at a makeshift memorial site on Las Vegas Boulevard on Tuesday, Oct. 3, 2017, in Las Vegas. A gunman opened fire on an outdoor music concert on Sunday killing dozens and injuring hundreds. (AP Photo/Chris Carlson)

Investigators walk through debris on festival grounds across the street from the Mandalay Bay Resort and Casino on Tuesday, Oct. 3, 2017, in Las Vegas. Authorities said Stephen Craig Paddock broke windows on the casino and began firing with a cache of weapons, killing dozens and injuring hundreds at the festival. (AP Photo/Marcio Jose Sanchez)

An investigator works in the room at the Mandalay Bay Resort and Casino where a gunman opened fire from on a music festival Tuesday, Oct. 3, 2017, in Las Vegas. The gunman killed dozens and injuring hundreds at the festival. (AP Photo/Marcio Jose Sanchez)

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Kris Delarosby, right, and Colleen Anderson, left, hold Charleen Jochim, center, as they walk towards a hospital in search of information on a missing friend, Steve Berger of Minnesota, Tuesday, Oct. 3, 2017, in Las Vegas. Berger is missing since he attended the Route 91 Harvest festival Sunday, and friends and family continue to search for him. (AP Photo/Gregory Bull)

Healthcare workers from UMC Hospital in Las Vegas, get free food on Tuesday, Oct. 3, 2017. Hospitals were overflowing with victims of a gunman who fired on a concert from the 32nd floor of a Las Vegas hotel. (AP Photo/Gregory Bull)

Flowers, candles and toys are left at a makeshift memorial site on Las Vegas Boulevard on Tuesday, Oct. 3, 2017, in Las Vegas. A gunman opened fire on an outdoor music concert on Sunday killing dozens and injuring hundreds. (AP Photo/Chris Carlson)

People leave messages at a makeshift memorial for victims of a shooting, Tuesday, Oct. 3, 2017, in Las Vegas. Authorities said Stephen Craig Paddock broke windows on the Mandalay Bay casino and began firing with a cache of weapons, killing dozens and injuring hundreds at the festival. (AP Photo/John Locher)

A Las Vegas police officer stands by a blocked off area near the Mandalay Bay casino, Tuesday, Oct. 3, 2017, in Las Vegas. Authorities said Stephen Craig Paddock broke windows on the casino and began firing with a cache of weapons, killing dozens and injuring hundreds at the festival. (AP Photo/John Locher)

Crystal Vo, left, and Khoi Trinh visit a makeshift memorial for victims of the shooting at a music festival, Tuesday, Oct. 3, 2017, in Las Vegas. Authorities said Stephen Craig Paddock broke windows on the Mandalay Bay Resort and Casino and began firing with a cache of weapons, killing dozens and injuring hundreds at the festival. (AP Photo/John Locher)

Flowers and signs are seen at a memorial site on Tuesday, Oct. 3, 2017 in Las Vegas. A gunman opened fire on an outdoor music concert on Sunday. (AP Photo/Chris Carlson)

Sally Marshall, with her 18-month-old granddaughter, Charlotte O’Neal, kneels down after they placed flowers at a memorial for their friend Kurt Von Tillow on Tuesday, Oct. 3, 2017, in Cameron Park, Calif. The Cameron Park man was one of the dozens of people killed Sunday night in the mass shooting in Las Vegas. (Randy Pench/The Sacramento Bee via AP)

Roberto Lopez, from left, Briana Calderon and Cynthia Olvera, of Las Vegas, pause at a memorial site on Tuesday, Oct. 3, 2017 in Las Vegas. Investigators trying to figure out why Stephen Paddock gunned down dozens of people from his high-rise hotel suite are analyzing his computer and cellphone, looking at casino surveillance footage and seeking to interview his longtime girlfriend. (AP Photo/Chris Carlson)

FILE – In this Friday, June 2, 2017, file photo, a security guard, left, inspects a man at the entrance of the hotel at the Resorts World Manila complex, in Manila, Philippines, where a gunman stormed the mall-casino complex earlier in the day. Across the globe, risks of attacks have made tight security at hotels and resorts routine. The most recent major attack in Asia, at the Resorts World Manila casino in the Philippines, shares similarities with the shooting Sunday, Oct. 1, 2017, in Las Vegas. And in many countries in Africa and the Middle East, tighter security has been essential for years. But that is less so in the United States, where hotels are reluctant to intrude on the privacy of guests. (AP Photo/Aaron Favila, File)

LAS VEGAS — Investigators trying to figure out why Stephen Paddock gunned down 59 people from his high-rise hotel suite are analyzing his computer and cellphone, looking at casino surveillance footage and seeking to interview his longtime girlfriend.

Nearly two days after the deadliest mass shooting in modern U.S. history, what set off the 64-year-old high-rolling gambler and retired accountant remained a big question mark Tuesday.

While the probe into his background included searches of two houses he owned in Nevada, some investigators turned their focus from the shooter’s perch to the killing grounds outside the Mandalay Bay hotel casino where his victims fell.

A dozen investigators, most in FBI jackets and all wearing blue booties to avoid contaminating evidence, entered the festival site where gunfire erupted Sunday night and country music gave way to screams of pain and terror.

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“Shoes, baby strollers, chairs, sunglasses, purses. The whole field was just littered with things,” said Nevada Attorney General Adam Laxalt, who told The Associated Press it was like a “war zone.” ”There were bloodstains everywhere.”

Paddock killed himself before a SWAT team blew off the door of his room on the 32nd floor. He had 23 guns with him at the hotel — along with devices that can enable a rifle to fire continuously, like an automatic — and 19 more guns at one of his homes, authorities said.

More than 500 people were injured in the rampage, some by gunfire, some during the chaotic escape. At least 45 patients at two hospitals remained in critical condition.

Retired FBI profiler Jim Clemente speculated that there was “some sort of major trigger in his life — a great loss, a breakup, or maybe he just found out he has a terminal disease.”

Clemente said a “psychological autopsy” may be necessary to try to establish the motive for the attack. If the suicide didn’t destroy Paddock’s brain, experts may even find a neurological disorder or malformation, he said.

He said there could even be a genetic component to the slaughter: Paddock’s father was a bank robber who was on the FBI’s most-wanted list in the 1960s and was diagnosed a psychopath.

Paddock had a business degree from Cal State Northridge. In the 1970s and ’80s, he worked as a mail carrier and an IRS agent and held down an auditing job in the Defense Department, according to the government. He later worked for a defense contractor.

He had no known criminal record, and public records showed no signs of financial troubles, though he was said to be a big gambler.

“No affiliation, no religion, no politics. He never cared about any of that stuff,” his brother, Eric Paddock, said outside his Florida home. He said he was at a loss to explain the massacre.

Nevada’s Gaming Control Board said it pass along records compiled on Paddock and girlfriend Marilou Danley to investigators. Danley is expected to speak with detectives when she returns to the U.S. from out of the country.

The FBI discounted the possibility of international terrorism early on, even after the Islamic State claimed responsibility for the attack.

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Sally Ho and Brian Skoloff in Las Vegas; Brian Melley in Los Angeles; and Sadie Gurman and Tami Abdollah in Washington contributed to this report.